This sounded like such a good idea at first… but now even Gizmodo has picked up on this series of videos! A few weeks ago Blake at Vimeo asked me to help him record some instructional videos on lenses and apertures and depth of field etc. I told him that it’d been done SOOOO many times before… I didn’t want to do anything too booorrriiinnnggg… we had to do something DIFFERENT… and then out of that, these 3 videos resulted – check them out below or on the Vimeo page:
Behind the Glass: An Introduction to Lenses from Vimeo Staff on Vimeo.
Here’s a excerpt from the Vimeo page followed by the two other videos after the jump…
"Aperture:
The aperture is the diameter of the lens opening. The larger the diameter of the aperture, the more light reaches the film or image sensor. The aperture also performs a critical function for focus. As the aperture decreases in size, the background and foreground gain sharpness. This zone of sharpness is called the depth of field.
Aperture is expressed as F-stop and will be indicated on your camera in abbreviations that look like this: F2.8 or f/2.8.
The "F" stands for the focal length of your lens, and the number indicates the diameter of the iris opening. (For a more in-depth explanation, head over to this lesson!)
Focus Ring
Located around the barrel of your lens, this helps you focus the image. Some lenses will also have an auto focus switch, which means that your lens can do the focusing for you on those days that your eyes are feeling a little tired.
Prime or Fixed Lens vs Zoom Lens
A prime lens has a fixed focal length, whereas a zoom lens has a handy ring that allows you to switch to different lens equivalents within the single lens. But don’t knock prime lenses entirely! They may be less versatile than a zoom, but they often have superior optical quality, are lighter weight, smaller bulk and cheaper.
Pro tip…
No matter what kind of lens you’re using, always try to zoom by foot (aka- walk yourself closer) to get near to the subject. This will always provide superior quality as opposed to trying to zoom in with the lens.
A Lens for Every Occasion!
Various lenses are suited for specific applications. Lets have a look at some common lenses and what they do.
16mm– An ultra wide lens, this bad boy distorts heavily, emphasizing objects in the foreground by making them look a lot larger than the background. Dynamic, but use with caution!
28mm– Standard for documentary and photojournalism to shoot cowboy shots, otherwise known as medium shots.
35mm– Another standard for documentary filming, also tight enough to shoot portraits.
50mm– Standard for cinema/video, it approximates the human eye’s typical focal length.
85mm– A popular portrait, or "beauty" lens. Capable of making everyone look lovely!
200mm– The top of the scale for most people, this is a telephoto lens. Their inherent shallow depth of field makes them useful in eliminating unwanted foreground and background objects by simply throwing them out of focus. Great for sports photography!
Now that we’ve had a friendly overview, let’s take a closer look at the wonders of focal length and what that means for your video. Onward to Episode 2!" Click below to see more videos…
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